Graphics Programs Reference
In-Depth Information
The Gray working space determines how a grayscale image will look on
your monitor. Within the Grayscale working space, we have access to
gamma settings, dot gain curves and the ColorSync Gray Working Space
(Mac only) as well as the ability to customize the dot gain to specii c
requirements.
1. Gamma settings dei ne the brightness of the midtone values on screen.
The choices of gamma settings enable you to base the display quality
equivalent to either a Macintosh (1.8) or PC (2.2) monitor, although there is
evidence that all monitors have become 2.2 these days, whether they are
Mac or PC.
Gray Gamma 2.2 is probably the best for most users, but feel free to
experiment. This setting anticipates the viewing conditions of a PC monitor
(important for web graphics), and the darkening is roughly equivalent to a
25% dot gain setting.
2. The dot gain settings, choices of either 10%, 15%, 20% or 30%, depend
on your printing conditions. The dot gain settings darken the on-screen
image, ef ectively anticipating the ef ect of the ink dot gain (or spread)
during on-press reproduction.
(To set your own dot gain proi le, choose “Custom” from the top of the
pop-up.) Note that these values only lighten or darken the appearance of
an image, while the actual output values are not af ected.
If you are outputting primarily to inkjet printers, matching the Gray working
space to the RGB color space is a good move. Simply translated, if you
are working in Adobe RGB or sRGB, use Gamma 2.2. If you are working in
ProPhoto RGB or Colormatch RGB, choose 1.8. This prevents any additional
gamma adjustments as we switch back and forth between color and
grayscale images.
If you work in a prepress environment, it is best to match the grayscale space
to the dot gain of the black ink. North American Prepess 2 setting presets will
create this match. However, it is always wise to consult your service provider
for customized settings in accordance with press specii cations.
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